[U-Boot] [PATCH v3 04/17] sf: Add extended addr read support for winbond|stmicro

[Jagannadha Sutradharudu Teki]

This patch provides support to read a flash extended address
register for winbond and stmicro SPI flashes.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>
---
Changes for v3:
	- none
Changes for v2:
	- none

 drivers/mtd/spi/spi_flash.c          | 2 ++
 drivers/mtd/spi/spi_flash_internal.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 05d1792..66b6b14 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -321,6 +321,8 @@ int spi_flash_cmd_bankaddr_read(struct spi_flash *flash, void *data)
 
 	if (idcode0 == 0x01) {
 		cmd = CMD_BANKADDR_BRRD;
+	} else if ((idcode0 == 0xef) || (idcode0 == 0x20)) {
+		cmd = CMD_EXTNADDR_RDEAR;
 	} else {
 		printf("SF: Unsupported bank addr read %02x\n", idcode0);
 		return -1;
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index de1a0df..1b29e2d 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -32,6 +32,7 @@
 #define CMD_BANKADDR_BRWR		0x17
 #define CMD_BANKADDR_BRRD		0x16
 #define CMD_EXTNADDR_WREAR		0xC5
+#define CMD_EXTNADDR_RDEAR		0xC8
 
 /* Common status */
 #define STATUS_WIP			0x01
-- 
1.8.3